![]() ![]() ![]() If all addresses disappear, it means something is corrupt and Outlook is replacing the NK2 with a new, clean one. Less used addresses are replaced by new addresses when the NK2 contains 1000 addresses in Outlook 2003 or 2000 address if using Outlook 2007. The existing *.NK2 shouldn't be replaced by a clean *.NK2 if this happens, but new addresses you've sent new mail to or replied to won't be saved to the file. If the users are losing addresses of people they recently replied to (but not older addresses), it's because Outlook crashes or does not close properly and the changes are not written to the NK2 file. We use Outlook and my users aren't very good at adding email addresses to the Contacts folder and rely heavily on the autocomplete cache, but it gets replaced often. The nickname files (.nk2) used by Outlook 2007 (and 2003) is found at C:\Documents and Settings\%username%\Application Data\Microsoft\Outlook if you are using Windows XP/2000 or C:\Users\%username%\Application Data\Microsoft\Outlook. This unpopular feature was removed from Outlook beginning with Outlook 2013. Look for these contacts in the Suggested Contacts folder. Outlook 2010 also creates a contact for people you send mail to, as insurance if the autocomplete cache becomes corrupt. See Suggested Contacts and Auto-Complete Lists to learn more about Outlook 2010's autocomplete cache and suggested contacts. Instructions are at Outlook doesn't save Autocomplete. If addresses are not saving in the auto-complete list between Outlook sessions and clearing the cache doesn't fix the problem, you may need to delete the RoamCache file. Press Windows key R to open the Run command and type or paste the following line and press enter to start Outlook. You can also use the /cleanautocompletecache switch to clear the cache.Ĭlose Outlook. You can type or paste %localappdata%\Microsoft\Outlook\RoamCache in the address bar of Windows Explorer then press Enter to open the folder location where the cache is stored in a file named Stream_Autocomplete_0_.dat.Ĭlear the autocomplete cache using the File, Options, Mail, Empty Auto-complete list button. You can clear the entire autocomplete file: in older versions you need to delete the *.NK2 file from your hard drive, while Outlook 2010 and newer has a button to clear the Autocomplete cache in Options (screenshot below).īeginning with Outlook 2010, Outlook does not use the NK2 file it stores the autocomplete cache in the mailbox or data file and caches the addresses in an autocomplete stream at C:\Users\%username%\AppData\Local\Microsoft\Outlook\RoamCache. ![]()
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